Aaron wrote 5 letters to friends each month for y months in a row. Write an expression to show how
many total letters Aaron wrote.

5y=letters

Step-by-step explanation:

5 is the slope in the equation and (y) is the months. In order to find out how many letters Aaron wrote, we multiply 5 by y to get the total.

reduce the friction between its moving parts

step-by-step explanation:

in fact, by reducing the friction between the moving parts of the machine, it is possible to reduce the energy wasted due to this friction; therefore, more input energy is converted into useful work, and this will improve the efficiency of the machine.

4 and 5)16.97 or 12√2

6)15.59 or 9√3

7)y = 15.59 or 9√3     x =27

8)17.80